Himself

Melvin looked around the empty halls then back at Sabrina's backside. She still hadn't noticed him even when the nerd came up behind her with his phone out to document this spectacle.

He managed to swing the phone around to get a better view of her jiggling breasts, then brought the camera lens down her stomach, and showing a bit of her bush, trimmed into an landing strip.

Melvin put his phone away, smirking as he looked one more time to make sure it was just him and Sabrina.

He quickly began fondling at her globes finally alerting Sabrina someone was in fact there seeing her naked.

"Quit touching me and help me out perv!" Was what Sabrina tried to say as she felt her flesh orbs being massaged roughly. But only mmphs could escape the tape against her mouth. As she tried to turn her head to see the culprit, Melvin ripped her tank top off, and used the remains to blindfold her and leaving fully naked sans for the soles on her shoes.

As Melvin began running his hand down her stomach toward her groin, the bell rang loudly causing Melvin to run off into the boy's bathroom to take care of something.

Leaving Sabrina bound, blindfolded, and bare as her fellow peers came out of their classroms.